If it's not batteries included if should not require people to add a huge amount of overhead to their projects to use it, stuff like JSX or create-react-app
That's neither required, nor being recommended by the wider community anymore.
> JSX
JSX on the other hand I feel like is something that is essential to React (yes, I know that some people disagree), and one of the few things it should provide/require, as it forms a cornerstone of it's UX. Getting things set up to understand JSX/TSX has been smoothed out a lot now, and hasn't been an issue in any greenfield project I have set up in the last 2-3 years.